/*
 * Copyright 2011-2018 Blender Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __UTIL_IES_H__
#define __UTIL_IES_H__

#include "util/util_param.h"
#include "util/util_vector.h"

CCL_NAMESPACE_BEGIN

class IESFile {
public:
	IESFile() {}
	~IESFile();

	int packed_size();
	void pack(float *data);

	bool load(ustring ies);
	void clear();

protected:
	bool parse(ustring ies);
	bool process();
	bool process_type_b();
	bool process_type_c();

	/* The brightness distribution is stored in spherical coordinates.
	 * The horizontal angles correspond to to theta in the regular notation
	 * and always span the full range from 0° to 360°.
	 * The vertical angles correspond to phi and always start at 0°. */
	vector<float> v_angles, h_angles;
	/* The actual values are stored here, with every entry storing the values
	 * of one horizontal segment. */
	vector<vector<float> > intensity;

	/* Types of angle representation in IES files. Currently, only B and C are supported. */
	enum IESType {
		TYPE_A = 3,
		TYPE_B = 2,
		TYPE_C = 1
	} type;
};

CCL_NAMESPACE_END

#endif /* __UTIL_IES_H__ */
